package com.atguigu.util;

import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

public class JDBCUtils {

    /**
     * 获取数据库的连接
     */
    public static Connection getConnection() throws Exception {
        Connection conn = null;
        PreparedStatement ps = null;

        //1.读取配置文件的4个基本信息
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("jdbc.properties");

        Properties pros = new Properties();
        pros.load(is);

        String user = pros.getProperty("user");
        String password = pros.getProperty("password");
        String url = pros.getProperty("url");
        String driverClass = pros.getProperty("driverClass");

        //2.加载驱动
        Class.forName(driverClass);

        //3.获取连接
        conn = DriverManager.getConnection(url, user, password);

        return conn;
        }

    /**
     * 关闭连接和Statement的操作
     */
    public static void closeResource(Connection conn, Statement ps) {
        try {
            if(ps != null)
                ps.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if(conn != null)
                conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    /**
     *
     * @Description 关闭资源操作
     */
    public static void closeResource(Connection conn,Statement ps,ResultSet rs){
        try {
            if(ps != null)
                ps.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if(conn != null)
                conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if(rs != null)
                rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
